Not completely sure about the question, but open the PhysicalSurface root node:

In the lower part you will find the SSS connections, in this case called ScatterDistR_mm for red, ScatterDistG_mm for green, ScatterDistB_mm for blue. The SSS 'Scatter is calculated in mm, and you can hang your red, green and blue SSS maps on them. Just like FireFly, the lowest option Scatter_Group is to separate the SSS with conflicting SSS groups. => Remember the dark blue area's when you got conflicting SSS groups in FireFly?

Here a simple skin setup where everything is build from the Diffuse texture. For SSS add the SSS maps on the Scatter RGB connections.

This is what you see in the renders in the other tread.

Remember to use very high render settings to get "believable" SSS renders because this adds lots of noise.

Best regards, Tony